<template>
    <el-card>
    <div>
        <!-- 头顶 -->
        <el-breadcrumb separator="/" class="a">
            <!-- :to="{ path: '/users' }"  跳转 -->
            <el-breadcrumb-item :to="{ path: '/users' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
            <!-- 头部的警告区域 -->
            <el-alert :closable="false"
            title="注意：只允许为第三级分类设置相关参数！"
            type="warning" show-icon>
            </el-alert>
        <!-- 选择商品分类区域 -->
        <el-row class="b">
            <el-col>
            <span class="b">选择商品分类：</span>
            <!-- 选择商品分类的级联选择框 -->
            <!-- options用来指定数据源 -->
                <!-- props用来指定配置对象 -->
                <el-cascader class="b"
                    clearable
                    expandTrigger="hover"
                    v-model="selectedCateKeys"
                    :options="cateList"
                    :props="cateProps"
                    @change="handleChange"></el-cascader>
            </el-col>

            <!-- 页签区域 -->
            <el-tabs class="d" v-model="activeName" @tab-click="handleTabClick" style="width: 100%;">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button class="a1" type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe >
                        <!-- 展开行 -->
                        <el-table-column type="expand" >
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->     
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 添加新参数</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column  label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column  label="操作" >
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" inon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" inon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button class="a1" type="primary" size="mini" :disabled="isBtnDisabled"  @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe >
                        <!-- 展开行 -->
                        <el-table-column type="expand" >
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->     
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 添加新属性</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column  label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column  label="操作" >
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" inon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" inon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-row>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加参数的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
                <!-- 添加参数的对话框 -->
                <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                    <el-form-item :label="titleText" prop="attr_name">
                        <el-input v-model="editForm.attr_name"></el-input>
                    </el-form-item>
                </el-form>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="editDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="editParams">确 定</el-button>
                </span>
        </el-dialog>
    </div>
    </el-card>
</template>

<script>
export default {
    name: 'Xm01Goodscanshu',

    data() {
        return {
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                    {required:true, message:'请输入参数名称', trigger:'blur'}
                    ]
            },
            // 商品分类列表
            cateList: [],
            // 级联选择框的对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定的数组
            selectedCateKeys: [],
            activeName:[],
            activeName:'many',
            manyTableData:[],
            onlyTableData:[],
            isBtnDisabled:false,
            addDialogVisible:false,
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name:[
                    {required:true, message:'请输入参数名称', trigger:'blur'}
                    ]
            }
        };
    },

    created() {
        this.initTable();

    },
    computed:{
        //   当前选中的三级分类的Id
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2];
            }
            return null;
        },
         // 动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数';
            }
            return '静态属性';
        },
    },
   

    methods: {
        // 点击按钮，展示修改对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const res = await this.$http.get(`/api/private/v1/categories/${this.cateId}/attributes/${attr_id}`, {params:{
                attr_sel:this.activeName
            }});
            if(res.meta.status !== 200){
                return this.$message.error('获取参数信息失败！');
            }
            this.editForm = res.data;
            this.editDialogVisible = true;
        },
        // 重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields();
        },
        // 点击按钮，修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid) return;
                const res = await this.$http.put(`/api/private/v1/categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                });
                if(res.meta.status !== 200){
                return this.$message.error('获取参数失败！');
            }
                this.$message.success('获取参数成功！');
                this.getParamsData();
                this.editDialogVisible = false;
            })
        },
        // 文本框失去焦点，或摁下了Enter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue ='';
                row.inputVisible = false;
                return;
            }
            // 如果没有return，则证明输入的内容，需要做后续的处理
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = '';
            row.inputVisible = false;
            // 需要发起请求，保存这次操作
            this.saveAttrVals(row);
        },
        // 根据ID删除对应的参数项
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)
            // 用户取消了删除操作
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除！');
            }
            // 删除的业务逻辑
            const res = await this.$http.delete(`/api/private/v1/categories/${this.cateId}/attributes/${attr_id}`);
            if(res.meta.status !== 200){
                return this.$message.error('删除参数失败！');
            }
                this.$message.success('删除参数成功！');
                this.getParamsData();
        },
        // 将对 attr_vals 的操作，保存到数据库
        async saveAttrVals(row){
            const res = await this.$http.put(`/api/private/v1/categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            });
            if(res.meta.status !== 200){
                return this.$message.error('修改参数失败！');
            }
            this.$message.success('修改参数成功！');
        },
        // 点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible = true;
            // 让文本框自动获得焦点
            // nextTick 方法的作用，就是当页面上元素被重新渲染后才会执行回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数和选项
        handleClose(i, row){
            row.attr_vals.splice(i, 1);
            this.saveAttrVals(row);
        },
        // 点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid) return;
                const res = await this.$http.post(`/api/private/v1/categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                });
                if(res.meta.status !== 201) {
                return this.$message.error('添加参数失败！');
            }
                this.$message.success('添加参数成功！');
                this.addDialogVisible = false;
                this.getParamsData();
            })
        },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields();
        },
        handleTabClick(){
            //console.log(this.activeName)
            // 获取参数列表数据
            this.getParamsData()
        },
        //获取参数列表数据
        async getParamsData(){
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = [];
                this.onlyTableData = [];
                return
            }
            // 反之，选中的是三级分类
            // console.log(this.selectedCatKeys)
            // 根据所选分类的id和当前所处面板参数，获取数据请求
            const res = await this.$http.get('/api/private/v1/categories/'+this.cateId+'/attributes', {params:{sel: this.activeName}})
            if(res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
                res.data.forEach(item =>{
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                // 控制文本框的显示与隐藏
                item.inputVisible = false;
                // 文本框中输入的值
                item.inputValue = ''
            })
            // console.log(res.data)
             // 通过判断来挂载到对应的表格上
             if(this.activeName == 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 监听级联选择框选项发生变化的事件
        handleChange(){
            // console.log(this.selectedCatKeys)
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                return
            }
            this.getParamsData()
            // 反之，选中的是三级分类
            // console.log(this.selectedCatKeys)
        },
        //列表
        async initTable(){
            let res=await this.$http.get(`/api/private/v1/categories`);
            this.cateList=res.data;
            // console.log(res.data);
            // this.total=data.total;
        }
    },
};
</script>

<style lang="scss" scoped>
    .a{
        width: 100%;
        height: 60px;
        background-color: #e0e5ee;
        text-align: center;
        line-height: 60px;
    }
    .el-row{
        margin: 15px 0;
        float: left;
    }
    .b{
        float: left;
    }
    .d{
        float: left;
        margin: 15px 0;
    }
    .a1{
        float: left;
    }
</style>